Member Directory The AAS maintains a membership directory to facilitate member interaction and to support the conduct of official Society business. Search directory for: Filter Results By Clear Filters Type of Science Galaxy Formation & Evolu (4) Active Galactic Nu (3) GRBs (3) High-Energy Pheno (3) Interstellar Me (3) Star Formation & Evolu (3) Supernovae (3) Exopla (2) Clusters of Galaxies/Large-scale Struc (1) Cosmo (1) Galactic Structure & Stellar Populat (1) Heliophy (1) (-) Astronomy Educa (1) State NY (1) Facet State City Alexandria (1) Alpine (1) Ames (1) Atlanta (1) Baltimore (3) Berkeley (2) Bethesda (1) Boston (1) Bothell (1) Boulder (1) Bowling Green (1) Bozeman (1) Cambridge (2) Canton (1) Cary (1) Chapel Hill (1) Charlottesville (2) Chicago (2) Chula Vista (1) Cincinnati (1) Clemson (1) Cleveland (1) Columbus (2) Conway (1) Costa Mesa (1) Crestwood (1) Dahlonega (1) Dallas (1) Daytona Beach (2) East Hartford (1) East Lansing (2) Ellensburg (1) Everett (1) Farmersville (1) Flagstaff (2) Forest Hills (1) Fresno (1) Glendale (1) Grand Rapids (1) Greenbelt (3) Helsinki (1) Heraklion (1) Hilo (2) Honolulu (2) Houston (1) Huntingdon (1) Indianapolis (1) Iowa City (1) Ithaca (1) Kamuela (1) Lancaster (1) Laramie (1) Laurel (1) Leiden (1) Logan (1) Los Lunas (1) Loudonville (1) Louisville (1) Lowell (1) Marriottsville (1) Media (1) Miami (1) Middletown (1) Missisauga (1) Mississippi State (1) Moffett Field (1) Montreal (2) Mountain View (2) Murrysville (1) Nashville (1) New London (1) Norman (1) Oakland (1) Orlando (1) Parkville (1) Pasadena (3) Peoria (1) Pomona (1) Princeton (1) Raleigh (1) Richardson (1) Saint Davids (1) San Francisco (1) San Luis Obispo (1) Santiago (1) San Ysidro (1) Schenectady (1) Seattle (1) Sheboygan (1) Silver Spring (2) Stanford (1) Stockton (1) Taipei (1) Takamatsu (1) Tempe (1) Toronto (1) Towson (1) Tucson (2) University Park (1) Washington (3) Williamstown (1) Winnipeg (1) Youngstown (1) (-) New York (1) Facet City Membership Class F (3) JR (1) (-) Full Member (1) Facet Membership Class Division HEAD (1) Facet Division Showing 1-1 of 1 results David Helfand Full Member Affiliation Columbia University State/Province NY Country United States